Drilling-tool.



A. c. VAUOLAIN.

DRILLING TOOL. APPLICATION FILED JUNE 13, 1910.

984,323. Patented Feb. 14,1911

ANDREW C. VAUCLAIN, OF PHILADELPHIA, PENNSYLVANIA.

DRILLING-TOOL.

Specification 01' Letters Patent.

Application filed June 13, 1910.

Patented Feb. 14, 1911.

Serial No. 566,684.

To all whom it may concern:

Be it known that I, Annnnw (l. Vlmcmm, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain lin'iprownnents in Drilling'loels, of which the following is a specification.

My invention relates to boring tools, twist drills and the like, and the object of my invention is to. provide a tool of this character with a maximum amount of cutting edge whereby the ctlective cut; of the same may be increased and facilitated and undue heating of the drill, particularly at the central portion of or adjacent to the cut-ting edge may be avoided.

My invention is particularly applicable to drills familiarly known as high speed drills and in the drawings herewith I have shown several tools within the scope of my invention, in which:

Figure 1, is a view of the cutting end of one t'orm of drill embodying my invention; Fig. 9, is a side elevation ot' the same; Fig. 3, is an edge view of the cutting end; Fig. 4t, is a perspective view of the cutting end, and Fig. 5, is a view similar to Fig. i, showing a slightly modified construction.

In the manufacture of ordinary twist or flat drills, the cutting end. is o'l such a character that a substantially straight portion is left at the end intermediate the beveled an gular cutting edges, and the work of such straight portion is in the nature of a grinding or twisting of the metal against which it is directed, with the result of undue heating, and in many instances, the burning oil of such portion with the consequent necessity of cutting away a portion of the tool before it may be sharpened for further use, and the possible retempering of such tool. It has been proposed to point drills of this type, but in all instances of which I am aware the pointing has been etl'ccted in such manner as to leave relatively little metal to serve as a support for such point, and in consequence the torsional strain applied to the tool has caused such point to break oil. In the construction that I have adopted, I bring the cutting edges of the tool, of which there will be a plurality in all instances to a common center or point at which there is consequently no motion and hence relatively little or no heating produced. To etlect this result, I provide a bar of a peculiar section, comprising side or web portions 1 and 2, lapping at. the center as indicated at 3, so that the plane of one portion on one side of the tool is directly in line with the plane of the other portion on the other side of the tool. The end or each portion 1 and 2 of such structure is then ground to the proper bevel, as indicated at 4-, bringing the cutting edges to a central line a and then by reducing the material ot. each section adjacent a line at; an angle, pre'terably at a right angle to the plane of the cutting edges as indicated at 1 the cutting edges are broughtto an actual central point with su'tlicient metal behind thcm to support the structure in its work. In Fig. l, the construction is wholly angular and is probably sullicient for all purposes. but in cases where additional strength is needed or required I may pr0- V'ltlt) the section with tillet's 5 at the points where the portions '1. and 2 join the central web 3. as indicated in Fig. 5.

The tool made in accordance with my in- \eution having greater cutting area may be driven with much less power and accomplish more work in a given length of time. At the same time, there will be no undue heating such as is oc ;:asioncd'in the use of drilling tools of the ordinary character.

As may be understood, my invention is applicable to all forms of flat or twist drills or tools designed for drilling purposes, and my claims are to be construed as covering such structures.

I claim:

1. A drill having a pair of integrally connected webs with a lapping central portion, each web having a cutting edge formed by beveling the end of the same, the lapping portion of each web being removed adjacent the cutting edges whereby they are brought to a common center or point.

2. A drill having a pair of integrally connectcd webs in di'tlerent planes with a lap ping central portion, each web having a cutting edge iormed by beveling the end of the same, said cutting edges lying in the same plane, and the lapping portion of each Web being removed adjacent said cutting edges whereby they are brought to a common center or point.

A drill having a plurality of integrally connected Webs in clifierent planes With a In testimony whereof, I have signed my lapping central portion, each Web having a name to this speclficatlcn, 1n the presence cutting edge formed by bevellng the end of of two subscribing Witnesses.

the same, and said cutting edges meeting at ANDREN C. VAUCLAIN. 5 a central point by reducing the lapping por- Witnesses:

tions of each Web at an angle With respect MURRAY C. BOYER,

to said cutting edges. ROBERT T. MOCRACKEN. 

